Jennings: Manual of Mosses — 26. Leucodontaceae 185 



Co.: Roystown Branch, lYi mi. s. of Schellsburg. C.M.B. July 19, 1941. Cambria 

 Co.: T. P. James. (Porter's Catalogue). Indiana Co.: T. P. James. (Porter's Cata- 

 logue). Washington Co.: On bark of log, May 8, 1891, and on rotten wood, Nov. 

 5, 1892. Near Washington. Linn & Simonton. 



3. Leucodon SCIUROIDES [Linnaeus] Schwaegrichen 

 (Hypmim sciuroides Linnaeus; Fisstdens schnoides Hedwig) 



Rigidly cespitose, brownish to olive-green: secondary stems terete and jula- 

 ceous, more or less curved-ascending at the ends, usually 3 or 4 cm long; leaves 

 densely crowded, slightly secund, closely imbricate when dry, more or less 

 open-spreading when moist, lance-ovate, long and slenderly acuminate, entire, 

 usually about 5-plicate, somewhat decurrent; costa none; leaf-cells about as for 

 L. brachypus; perichaetial leaves pale, non-plicate: seta about 7 or 8 mm long, 

 rather stout; capsule oblong-elliptic, brown, exserted; lid conic, same color as 

 urn; peristome-teeth slender, pale to whitish, remotely articulate, entire or split 

 towards the base; annulus simple, falling away in fragments; calyptra yellowish- 

 brown apical ly, reaching to the base of capsule; spores mature in spring but 

 capsules very rarely found. 



On trunks of trees, or very rarely on rocks, in woods; Europe, and from 

 lower eastern Canada through the northeastern United States to Pennsylvania 

 and Iowa. Not yet found in our region. 



2. Leptodon Mohr 



(Forsstroemia Lindberg) 



Autoicous, rarely dioicous; quite robust to slender, green to brownish- 

 green, mostly dull: leaves drying imbricate and non-plicate or indistinctly pli- 

 cate, when moist erect-spreading, ovate to oblong, short acute, also ovate and 

 acuminate, margin more or less revolute, entire or ape.x serrate; costa rather 

 narrow, ending about the middle; apical and median cells elliptic or oval, the 

 angular rounded quadrate to transversely oblong; inner perichaetial leaves 

 sheathing, long and narrowly pointed, costate or ecostate: seta short, 2-5 mm, 

 straight, red to yellowish; capsule mostly exserted, ovate to oval, pale or red- 

 dish-brown; annulus narrow or none; peristome-teeth lance-linear, mostly yel- 

 lowish, pellucid, densely articulate, finely papillose above, sometimes broken 

 through on the divisural; inner peristome none or very rudimentary; spores 

 .020-. 035 mm, yellowish-green, finely papillose; lid conic, narrowly acuminate 

 to shortly rostrate; calyptra cucullate with erect hairs, rarely smooth. 



A widely distributed genus of about 20 species, mostly arboreal in habitat; 

 4 species in North America; 1 species in our region. 



1. Leptodon trichomitrion (Hedwig) Mohr 



(Pterigynandnim trichomitrium Hedwig; Forsstroemia 

 trichomitrid (Hedwig) Lindberg) 



Plate XXXVI 



Broadly cespitose, rather rigid, yellowish-green; primary stems creeping, 



filiform, the secondary stems numerous and abundantly branched; leaves close, 



loosely erect-spreading, lance-ovate, shortly acuminate to acute, entire, when 



